JB/T 6296.6-1992 Technical conditions for flexible graphite seals for steam turbine piping accessories JB/T6296.6-1992 Standard download and decompression password: www.bzxz.net

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Pressing Machinery Ring Industry Standard of the People's Republic of China JB/T6296.61992
1992-06-264
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JB/T6296.61992
This standard specifies boilers, steam turbines, gas turbines and The basic requirements for flexible stone seals for auxiliary machinery. This standard applies to flexible graphite seals for boilers, steam turbines, gas turbines and their auxiliary machinery. Flexible graphite seals (hereinafter referred to as seals) used in other industries can be used as a reference. 2 Reference standards
GB700
GB1184
GB2598
GB3280
Carbon structural steel
Shape and position tolerances without tolerance requirements Cold-rolled stainless, heat-resistant steel strip
Stainless acid-resistant and heat-resistant steel sheet technical conditions 9 Flexible graphite sheet density test method
ZBJ22009
ZBJ22010 Flexible graphite sheet tensile strength Test method Flexible graphite sheet
ZBJ22012
Compression rate and rebound rate determination method
Ash content determination method
Flexible graphite sheet
ZBJ22013||tt| |ZBJ22014 Method for determination of fixed carbon content of flexible graphite sheets ZBK54003 Steam turbine hydraulic pressure test technical conditions 3 Technical requirements
3.1 The physical and mechanical properties of flexible graphite should comply with the provisions of the table below. Table
Dense
Plate
8/cm3
Skin
Packing
1.6
Tensile strength||tt ||MPa
≥3.5
Elasticity
Rebound
%
>30
The density deviation of flexible graphite shall not be greater than ±0.1 g/cm2. 3.2
3.3
The thickness deviation of the seal shall not be greater than ±0.08mm. Gray
%
minutes
0.4
fixed carbon content
%
96
seal surface Roughness: The packing ring is properly wound gasket, and the composite gasket is 323.44
3.5. The parallelism of the two sealing surfaces of the seal should comply with GB1184.3.6. The steel strip material for the spiral wound gasket should be 1Cr18Ni9Ti, and the technical conditions should comply with GB2598.
Suitable
Temperature
c
Use
Degree
-200~1600
3.7 Winding with reinforcing ring The reinforcing ring material of the gasket is made of 0Cr13 or Q235-A steel with a galvanized surface, and the technical conditions should comply with GB3280 or GB700.
3.8 The reinforcing plate material for composite gasket should be 1Cr18Ni9Ti or other materials, and the technical conditions should comply with GB3280 or corresponding standards. 1992-06-26rat
1993-01-01
4 Testing and Inspection
JB/T6296.61992
4.1 Each batch of flexible graphite materials should be physically and mechanically inspected For performance testing, all indicators should comply with the provisions of Article 3.1. 4.1.1 Density test is in accordance with ZBJ22009.
4.1.2 Tensile strength test according to ZBJ22010. 4.1.3 Rebound rate test according to ZBJ22012.
4.1.4 Ash content test according to ZBJ22013.
4.1.5 Fixed carbon content test is in accordance with ZBJ22014. 4.2 The seals should be 100% visually inspected, and the surface should be smooth without obvious bubbles, cracks, wrinkles, scratches, impurities and other defects. 4.3 The dimensional tolerance and geometric tolerance of seals should comply with the provisions of Articles 3.3 to 3.6. 4.4 Take 10% of the first batch of products of the same specification (but not less than 2 pieces) for a sealing test. The test pressure is 1.5 times the working pressure and the time is not less than 2 minutes. There must be no leakage at the sealing part and the sealing parts must not be damaged. Rings and peeling phenomena. The test method refers to ZBK54003. 5 Marking, packaging, storage
s
5.1 The product name, specification, model, manufacturer name, date of manufacture, etc. should be marked on the packaging of the seal. 5.2 The packaging of seals should ensure that they are not damaged during transportation and storage. 5.3 The packaging box should be accompanied by a packing list, which should be marked: a.
Manufacturer name
b. Product name and specification model;
Quantity and weight:
c.
d． Batch number:
e, date of manufacture.
5.4 Products leaving the factory should be accompanied by a product certificate. 5.5 The product should be stored in a clean and dry place. Additional notes:
This standard is proposed and managed by Shanghai Power Generation Equipment Complete Design Institute. This standard is drafted by Rongcheng Graphite Products Factory, Shandong Province. The main drafters of this standard are Gong Yunzhao, Ren Qihua, and Fang Chonghua. 2
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